INVESTIGADORES
MENENDEZ Ana Bernardina
artículos
Título:
Comparative symbiotic performance of native rhizobia of the Flooding Pampa and strains currently used for inoculating Lotus tenuis in this region
Autor/es:
ANALÍA I. SANNAZZARO; MARÍA VERÓNICA BERGOTTINI; ROSALÍA CRISTINA PAZ; LUIS NAZARENO CASTAGNO; ANA BERNARDINA MENENDEZ; OSCAR ADOLFO RUIZ; FERNANDO PIECKENSTEIN; MARÍA JULIA ESTRELLA
Revista:
ANTON LEEUW INT. J. G.
Editorial:
SPRINGER
Referencias:
Lugar: DORDRECHT, NETHERLANDS; Año: 2010 vol. 99 p. 1 - 9
ISSN:
0003-6072
Resumen:
The Flooding Pampa (FP) is the most
important area for cattle breeding in Argentina. In
this region, persistence and yield of typical forage
legumes are strongly limited by soil salinity and
alkalinity, which affect around 30% of the total area.
Instead, naturalized Lotus tenuis is the main forage
legume in this region. Rhizobial strains currently
used for inoculating L. tenuis in the FP are exotic or
native from non-saline soils of this region, their
taxonomic identity being unknown. Assuming that
rhizobia native from the most restrictive environments
are well adapted to adverse conditions, the use
of such isolates could improve the productivity ofLotus tenuis is the main forage
legume in this region. Rhizobial strains currently
used for inoculating L. tenuis in the FP are exotic or
native from non-saline soils of this region, their
taxonomic identity being unknown. Assuming that
rhizobia native from the most restrictive environments
are well adapted to adverse conditions, the use
of such isolates could improve the productivity ofL. tenuis in the FP are exotic or
native from non-saline soils of this region, their
taxonomic identity being unknown. Assuming that
rhizobia native from the most restrictive environments
are well adapted to adverse conditions, the use
of such isolates could improve the productivity of
L. tenuis in the FP. Hence, the goal of this study was
to evaluate the symbiotic efficiency of selectedin the FP. Hence, the goal of this study was
to evaluate the symbiotic efficiency of selected
L. tenuis rhizobia native from the FP, as compared with
strains currently used for field inoculation of this
legume. Under non-stressing conditions, the symbiotic
performance of native strains of FP exceeded those
ones currently used for L. tenuis. Moreover, the
symbiotic performance of the native strain ML103
was considerably high under salt stress, compared with
strains currently used as inoculants. Analysis of 16S
rRNA gene sequencing revealed that unclassified
rhizobia currently used for field inoculation ofrhizobia native from the FP, as compared with
strains currently used for field inoculation of this
legume. Under non-stressing conditions, the symbiotic
performance of native strains of FP exceeded those
ones currently used for L. tenuis. Moreover, the
symbiotic performance of the native strain ML103
was considerably high under salt stress, compared with
strains currently used as inoculants. Analysis of 16S
rRNA gene sequencing revealed that unclassified
rhizobia currently used for field inoculation ofL. tenuis. Moreover, the
symbiotic performance of the native strain ML103
was considerably high under salt stress, compared with
strains currently used as inoculants. Analysis of 16S
rRNA gene sequencing revealed that unclassified
rhizobia currently used for field inoculation of
L. tenuis and native strains grouped with the genusand native strains grouped with the genus
Mesorhizobium. As a whole, results obtained demonstrate
that soils of the FP are a source of efficient and
diverse rhizobia that could be used as a sustainable
agronomic tool to formulate inoculants that improve
forage yield of L. tenuis in this region.. As a whole, results obtained demonstrate
that soils of the FP are a source of efficient and
diverse rhizobia that could be used as a sustainable
agronomic tool to formulate inoculants that improve
forage yield of L. tenuis in this region.L. tenuis in this region.